. Compendium of meteorology. Meteorology. Fig. 4.—Regener-photographs of the ultraviolet spectrum taken in the stratosphere. minutes, being continuously exposed in the meantime. At the instant the plate is advanced, a small light bulb is turned on by which the readings of two aneroid gauges (standard barograph and low-pressure baro- graph) as well ai of a bimetallic strip to indicate the temperature of the instrument are recorded. On the plate which has a diameter of 10 cm the step-shaped interruptions of the long rays are the shadows of the two indicators connected to the aneroids; they repre
. Compendium of meteorology. Meteorology. Fig. 4.—Regener-photographs of the ultraviolet spectrum taken in the stratosphere. minutes, being continuously exposed in the meantime. At the instant the plate is advanced, a small light bulb is turned on by which the readings of two aneroid gauges (standard barograph and low-pressure baro- graph) as well ai of a bimetallic strip to indicate the temperature of the instrument are recorded. On the plate which has a diameter of 10 cm the step-shaped interruptions of the long rays are the shadows of the two indicators connected to the aneroids; they represent lower pressures the closer thej' approach the center. The clear ultraviolet spectra are located diametrically opposite the pressure indications and they are seen to extend to shorter wave lengths the greater the altitude and the smaller the quantity of ozone traversed by the solar radiation. In addition, the plate also bears a mer- cury calibration spectrum. The entire device, including a protective frame, weighs kg. If X„ represents the shortest wave length of the solar spectrum at an alti- tude hn and zenith distance z„, and if Xn represents the total quantity of ozone located above the instru- ment, then, approximately. a;2a2 sec 22 = a^iai sec Zi (9) Further improvements are obtained with an accurate intensity measurement at the end of the spectrum and elimination of diffuse sky light, for instance with the aid of a magnetically oriented hemispherical stop [86]. Coblentz and Stair [15] and Stranz [91] attempted to simplify the methods by replacing the spectrograph by a cadmium cell and filter as was done in the first ozone measurements in 1921 at Arosa. The intensity values are transmitted radiotelegraphically as in the radiosondes. With the aid of a fi-ee balloon, A. Wigand as early as 1913 measured the ultraviolet end of the solar spectrum up to a height of 9 km. Shortly after the Regener ex- periments, the stratosphere balloon, which is capable of carrying
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